topology_description – An object representation of a deployment of MongoDB servers.

Represent a deployment of MongoDB servers.

class pymongo.topology_description.TopologyDescription

Representation of a deployment of MongoDB servers.

Parameters:

  • topology_type (int) – initial type

  • server_descriptions (dict[_Address, ServerDescription]) – dict of (address, ServerDescription) for all seeds

  • replica_set_name (Optional[str]) – replica set name or None

  • max_set_version (Optional[int]) – greatest setVersion seen from a primary, or None

  • max_election_id (Optional[ObjectId]) – greatest electionId seen from a primary, or None

  • topology_settings (Any) – a TopologySettings

apply_selector(selector, address=None, custom_selector=None)

List of servers matching the provided selector(s).

Parameters:

  • selector (Any) – a callable that takes a Selection as input and returns a Selection as output. For example, an instance of a read preference from read_preferences.

  • address (Tuple[str, int | None] | None) – A server address to select.

  • custom_selector (Callable[[List[ServerDescription]], List[ServerDescription]] | None) – A callable that augments server selection rules. Accepts a list of ServerDescription objects and return a list of server descriptions that should be considered suitable for the desired operation.

Return type:

list[ServerDescription]

Added in version 3.4.

check_compatible()

Raise ConfigurationError if any server is incompatible.

A server is incompatible if its wire protocol version range does not overlap with PyMongo’s.

Return type:

None

property common_wire_version: int | None

Minimum of all servers’ max wire versions, or None.

property has_known_servers: bool

Whether there are any Servers of types besides Unknown.

has_readable_server(read_preference=Primary())

Does this topology have any readable servers available matching the given read preference?

Parameters:

read_preference (_ServerMode) – an instance of a read preference from read_preferences. Defaults to PRIMARY.

Return type:

bool

Note

When connected directly to a single server this method always returns True.

Added in version 3.4.

has_writable_server()

Does this topology have a writable server available?

Note

When connected directly to a single server this method always returns True.

Added in version 3.4.

Return type:

bool

property known_servers: list[ServerDescription]

List of Servers of types besides Unknown.

property logical_session_timeout_minutes: int | None

Minimum logical session timeout, or None.

property max_election_id: ObjectId | None

Greatest electionId seen from a primary, or None.

property max_set_version: int | None

Greatest setVersion seen from a primary, or None.

property readable_servers: list[ServerDescription]

List of readable Servers.

property replica_set_name: str | None

The replica set name.

reset()

A copy of this description, with all servers marked Unknown.

Return type:

TopologyDescription

reset_server(address)

A copy of this description, with one server marked Unknown.

Parameters:

address (Tuple[str, int | None])

Return type:

TopologyDescription

server_descriptions()

dict of (address, ServerDescription).

Return type:

dict[Tuple[str, int | None], ServerDescription]

property topology_type: int

The type of this topology.

property topology_type_name: str

The topology type as a human readable string.

Added in version 3.4.